Numbers beginning with 615-559

Goodlettsville, a city in Davidson and Sumner counties, Tennessee. Goodlettsville was incorporated as a city in 1958 with a population of just over 3,000 residents; at the 2010 census, the city had a total population of 15,921. Goodlettsville chose to remain autonomous in 1963 when the city of Nashville merged with the government of Davidson County. Therefore, Goodlettsville is only governed by the Metropolitan Government of Nashville and Davidson County in a limited manner. source

Area codes 615 and 629 are area codes in Tennessee serving Nashville (Davidson County) and the 12 surrounding counties. 615 is the main area code, while 629 is an overlay covering the same area that will begin service in 2014. Besides Nashville, Murfreesboro, Franklin, Hendersonville, and Lebanon are other major cities in the 615/629 service territory. source